Device for pressing rollers, particularly for lacing-eyelets.



.l. SCHLUMPF.

DEVICE FOR PRESSIHG ROLLERS, PARTICULARLY FOR LACING EYELETS.

APPLICATION FILED FEB. 26, 1913.

1,205,796. Patented Nov. 21, 1916.

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' OFFICE.

JAKOB SCI-ILUMPF, OF SEEBACI-I, SWITZERLAND.

DEVICE FOR PRESSING ROLLERS, PARTICULARLY FOR LACING-EYELETS.

Application filed February 26, 1913.

To all whom it may concern:

Be it known that I, JAKOB SCHLUMPF, a citizen of the Republic of Switzerland, residing at Seebach, in the Canton of Zurich, Republic of Switzerland, have invented a new and useful Device for Pressing Rollers, Particularly for Lacing-Eyelets, of which the following is a specification.

The rollers hitherto used for lacing-eyelets in shoes were hitherto produced by turning. However this work takes up much time and therefore renders the manufacture of such rollers unprofitable. In order to avoid this drawback it has already been proposed to produce the rollers by pressing, and this in the manner, that a piece of wire was pressed into the desired shape by means of two stamps moved together in a direction at right angles to the longitudinal axis or to the fibers of the wire piece. However, this method proved to be impracticable for the reason, that the roller thus formed possessed two opposite longitudinal burs which were produced in the joint between the two mov able stamps and caused the lace passing over the roller to rapidly .waste away, also impaired the rotation of the roller. The said method has therefore not come into practice.

My invention relates to a novel device for pressing rollers, whereby the manufacture of the rollers is rendered practicable and the formation of any bur on the rollers is avoided. According to my invention, the workpiece is first on the periphery surrounded with several matrices and is then longitudinally pressed by means of two opposite stamps moved against the two end faces of the workpiece. Thus a roller perfectly free from longitudinal burs is produced, since during the pressing no play is left between the end faces of the matrices butting against each other.

I will now proceed to describe my invention with reference to the accompanying drawing, in which Figure 1 is an elevation of a pressing device, parts being shown in section and the two stamps occupying their position before the pressing,-Fig. 2 is similar to Fig. 1, the

two stamps occupying their position after the pressing, and Fig. 3 is an upper view of the device shown at Fig. 1, the work-piece and the upper stamp being removed.

Specification of Letters Patent.

Patented Nov. 21, 1916.

Serial No. 750,763.

Similar letters of reference refer to similar parts throughout the several views.

The pressing device illustrated is constructed as follows: A frame or plate a is provided with a longitudinal groove 6 of a rectangular cross section, in which two opposite matrices c 0 are longitudinally movable. The end faces 6 e of the two matrices 0 c are made to normally butt against one another and are each provided with a recess- 9 of a semicircular cross section. Each matrix 0 may have a vertical cross hole 1" and the frame a may have two holes 3 s, which are to register with the holes 7 1* at the moment that the two matrices 0 a butt against one another as shown in full lines, so that two pins 7 f can be inserted in the holes 7' s r s for locking the two matrices in their normal position. The frame a is in its center provided with a vertical cylindrical hole (Z, in which a lower stamp it is guided. The central hole d is to communicate with the longitudinal groove 6. An up per stamp 2' is to be in any well known manner vertically guided in the frame (not shown) of the respective press and in the axis of the lower stamp it. The lower stamp it is shown to have a concave upper end face on with a central hole a that slightly tapers downward. In a similar manner the upper stamp 71 has a concave lower end face m with a central hole n slightly tapering upward. When the two matrices 0 c butt against one another and the two stamps 2' It are in contact with the upper and lower sides of the two matrices respectively (Fig. 2), the recesses g g of the matrices and the concave end faces on m of the stamps are to form a space that has exactly the size and shape of a roller- 9 (Fig. 2) to be produced, which has two pivots corresponding to the two central holes a n In order to produce a roller 9 by means of the device described, first the two matrices c c are moved together in the groove 6 0f the frame a and are secured by means of the two pins f f, then a work-piece p, that is a piece of wire, having a diameter about equal to the smallest. diameter of the recess 9 g and such a length that its cubic contents is equal to that of the finished roller, is inserted in the recess 9 g, the lower stamp it occupying such a position, that the workpiece 19 projects above and below through the same distance from the two matri s c 0. Thereupon the upper stamp 71 is by the respective press moved downward and at the moment that it comes in contact with the workpiece p the two stamps i h are simultaneously moved in opposite directions so as to form the roller 9 by pressing.

The thickness of the two matrices c 0 may be equal to the length of the finished roller 9, measured from one outer edge to the other one, as shown. As during pressing no play is left between the end faces 6 e of the two matrices 0 0, it is evident, that no longitudinal bur can be formed on the finished roller 9, which will therefore present perfectly smooth surfaces. For taking the finished roller out of the frame first the upper stamp 2' is withdrawn upward, then the two pins f 7 are withdrawn and the two matrices c 0 are moved outward, about into the position indicated by the dotted lines in Figs. 2 and 3, whereby the roller q is liberated.

The shape of the recesses f] g in the two matrices c c and of the end faces of the two stamps 2' it will have to depend upon the size and shape of the roller 9 to be produced. The roller g may be made convex instead of concave as shown, and where so desired, the end faces of the two stamps i It may have -entral pivots instead of the central holes a if, so that the finished roller will receive central pivot-holes in its sides.

According to the construction of the respective preSS at disposal the two matrices c 0 may be so modified in any known manner as to be moved by the respective machine parts, such as eccentrics and the like, in which case the holes 7 s and the pins 7 are dispensed with.

The frame a described may be modified, for example in the manner, that more than two matrices c are radially guided in it.

It is to be understood that I am not limited to the vertical arrangement of the stamps, but the arrangement can be horizontal without departing from the spirit of my invention.

I claim:

In a pressing device for producing rollers and the like, a frame having a hole, recessed matrices guided on the frame and adapted to butt against each other so as to form a space registering with the hole in said frame, the walls of said space being adapted to engage the lateral surface of the work piece to be pressed, a stamp adapted to be moved first up to'a predetermined dis tance in said hole of the frame and then to be moved a further distance in the direction of its longitudinal axis for effecting the pressing of said work piece, the work piece to be pressed being inserted in said space so that the work piece rests with one of its extremities against the end of said stamp, and a second stamp arranged to be moved first so as to contact against the other extremity of said work piece and then to be moved axially a further distance for performing the pressing of said work piece in a direction oppositeto the direction of said first stamp, and means for locking the matrice parts in position,-the said locking means being removable whereby the matrice' parts may be separated to free the pressed work piece. I

JAKOB SCHLUMPF. Witnesses HENRY SOHLUMPF, CARL GUBEK.

Copiesof this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

